A captivating and exhilarating real-life experience of musical creation and generosity, "The Union" is an unprecedented look at the creative life of Elton John and his remarkable collaborative album with his early-career idol, Leon Russell. Never before filmed in his composing process, John is captured by director Cameron Crowe throughout the entire span of writing and recording the landmark album. This candid portrait of one of the world's most treasured artists and performers also documents an extraordinary journey of the heart-one that sent John to reinvigorate the life and musical career of Russell, to whom John hadn't spoken in more than 38 years.

Legendary producer T Bone Burnett, John's lifelong lyricist Bernie Taupin, icons Neil Young and Brian Wilson, legendary R&B organist Booker T. Jones, steel guitarist Robert Randolph, and a 10-piece gospel choir are featured on the album, while appearances by Ringo Starr, Stevie Nicks, Jeff Bridges, and Grace Jones color this documentary about a love of making music.